B) The other view is the present view, alphabetical listing by names of software companies that "own" the file format.~I personally feel this "view" is for programmers, many users don't many of the software companies' names associated with the file extensions, hence the difficulty.

eg: I've had to force X1 to index for *.MHT files, which took me a while to figure out that it's Microsoft who "owns" this file format!

While we haven't gone so far as to list the total file size by types (there are other stand-alone applications which perform this functionality), as suggested by pgk, the next release of X1 (i.e. X1 Social) will let users sort the file extension list by either:

Type or

Extension

Type is the traditional style that X1 has been using for years, where items are grouped by application.Extension is new and is an alphabetized list of file extensions.